To Be Protected - Demon Slayer

Kaira was 25 when she died. It had come suddenly and in the form of a friend. She died so quickly she didn't even get to utter her last words, simply passing on with blood dribbling down her chin. In her mind she wept, crying out in agony for the short life she had. She begged and pleaded for it to not be true, praying that someone would hear her and change her fate.
Although whatever had heard her didn't do exactly as she wanted. Instead she was reborn and given a very important task. What task? Save everyone she could, no matter what.

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'Is that... me? Why do I look like that?'

"I swear to get stronger and protect those that can't protect themselves."

"I miss home..."

"You poor thing. Don't worry, no one can hurt you now. I'll protect you."

"Yes, even you. I'll protect you, too."
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Main characters name is pronounced as K-eye-ra. Kaira. Or as the male name, Kai, with 'ra' put at the end.